Coffee maker



Sept. 23, 1941. y H, lKORS 2,256,717

COFFEE MAKER Filed July 18, '1938 Patented Sept. 23, 1941 COFFEE MAKER Henry F. Kors, Chicago, Ill., assignor, by mesne assignments, to Korwood Incorporated, Independence, Kans., a corporation of Kansasy .reputation July 1s, 193s, seri-.t1 No. 219,751

6 Claims.

This invention relates4 to a new and improved coffee maker.

The principal object of my invention is to provide a double-boiler type of coffee maker wherein the coffee is brewed in the inner container at a temperature best calculated to give good flavor without extracting the undesirable acids and caffeine, and wherein the outer container is so designed that it serves not only as a boiler, but, when emptied, is also the coffee server, the device being otherwise so designed that it may be used not only as a coffee maker, but also for the large variety of uses to which a double-boiler may be put.

A salient feature of my invention is the novel means. provided for filtering the coffee from the inner container into the outer container, the filter means being incorporated in the cover on the inner container along with a novel form of air inspirator nozzle which, when the inner oontainer is inverted over the outer container for filtering, allows air to bubble up through the coiee tov relieve the vacuum that would otherwise be created, while allowing the coffee to drain only through ythe filter means.

A special feature is the construction ofthe cover and inner and outer containers of glass, the cover beingpreferably formed withg-rooves or other depressions, leaving spaces between the filter cloth and the smalldrain holes provided' in the bot-torn of thev grooves or depressions, whereby to avoid clogging and consequent slow filtering.

Still another feature is the provision of ythe air inspirator nozzle in the knob provided on the' outside of the cover at the center Ithereof forr use in turning the cover in fastening the same' onto the inner container with the lter cloth clamped therebetween, Ithe knob serving also as a means for removing the cover from the container.

The invention is illustrated in the accompanyingdrawing, in which- Fig. 1 is a central vertical section through a coffee maker made in accordance with my invention, the inner container being shown in full lines in inverted draining position, and in dotted' lines in coffee brewing position;

Fig. 2 is a fragmentary plane view of a portion of the cover for the inner container, looking at the inner side thereof to show the arrangement of spaced filter holes and intermediate projections;

Fig; 3. isa similar view showing a modilied or alternative construction.;

Fig. 4 is a sectional detail illustrating still another modifred or alternative construction, and

Fig. 5 is a fragmentary horizontal sectional detail on the broken line 5--5 of Fig. l.

Similar reference numerals arey applied to corresponding parts throughout the views.

Referring first to Figs. 1 and 2, the numerals 'I andf'- designate the inner and outer containers for the double-boiler coffee maker of my invention. Both are illustrated as made of glass, but it should be understood that either or both may be madeof aluminum or other material and porcelain enameled, if desired. AA pouring lip or spout 9 is provided on the outer container 8', inasmuch as I contemplate having the. outer container usedas the coffee` server in addition to being lthe boiler. A handle l is suitably securedv to the container 8 by a metal band clamp Il fitted on the annular bead l2 provided on the outside of the container 8 near the top. A band I3 similarly mounted on an annular bead I4' on the outside of the container 'I near the open top thereof provides a place for' attaching the handle I5 and' also, serves as a means for supporting the inner container T upon they rim I6 of the outer container a'in' either of the positions shown in Fig. l, Ithe container l' being shown in dotted lines: in brewing position' in Fig. 1' and in full lines in inverted filtering position. |31 is the cover for the inner container 'I' having an annular rim I8 adapted to fit freely around the open end of the inner container, as shown. The cover l'l-l is also preferably made'of gil-ass to match the containers l' andi 8; but, of course,` wherey other material is used? inthe containers, the cover will be made of thev same material. Bosses I9 formed on the upper end" of the inner' container have bayonet slots 2E! therein opening fromr the topy of the container adapted tofreoeive projections 2l provided on the inside of the rim I8 inthe manner indi'- catedin: Fig. I. A knob 22 formed integral withthev coverv IT at the center thereof serves asa meansk for turning the cover to move the projections. 2=`I toward the offset inner ends of the' bayonet. slots 20.

The cover IF has a multiplicity of filter holes 2-3 providedl therein located at the corners of a multiplicity of projections 24fof frusto-pyramidali form formed onthe inside of the cover. A filter cloth 254 rests against' the inside of the cover over thesey projections 2'4 with its marginall portion 26 arrangedy to be clamped betweenl the rim of the container 1f' andthe cover I1 when the latter is appliedv tothe containerin the manner illustratedf.

The construction illustrated 'in'Fig 3 has the If desired,V a spacer 21 of wire cloth may be I provided between the cover and the lter cloth 25, as shown in Fig. 4, in which event the cover I holes 23a provided in the spiral groove between v consecutive turns of the continuous spiral pro- 1 jection 24a provided on the cover Ila.

IIb will not require countersinkingl of the f An air inspirator nozzle 28 projects inwardly the container 'I to the space above the' coifee when said .inner containenis inverted .over the l outerrcontainer 8 to .lterthe coffee therein, as illustrated: intfull Vlines in. Fig. 1. 'Il'i'e-hole 32 i tapers inwardly-to provide-a restricted air inlet orifice'33 at the .inner end-of the. nozzle :28. The

l nozzle 28is elongatedsuificientlyto insure oper- 1 ating, as hereinafterndescribed, but doesnot extend beyond the .plane of YVthefline -y which j concideswith the planeo the edge of the rim of theY cover I'I, so asto permitplacing the cover on a table tor other flat surface resting squarely the hole v32 inthe inversion of. the. inner container I Vwill .be sure to drop off so as not to interfere with freev entry ofair into the outer end i ofthethole 32. Y

, In operation, the inner container] containing J ground coffee Yalong with the appropriate amount of'water 'is placed in the ,outercontainer 8, as illustrated in dotted lines vin Fig. 1, after enough i water has been put'. in the outer container to boil without danger of overowing.. This doublel boiler ,then brews the coifeezin the inner conf tainer, and it takes about-seven minutes to yprof 3 duce fairly strong coffee.,-,In the brewing process,Y the llltu'dv in the inner Vcontainer never` reaches.'`

a scalding temperatura'andl -have found that. a mellow iiavored coffee is obtained free ofA any of is poured out from the outencontainer 8, using 1 handle, I8. t 'I'hen the inner container is inverted 3 over the outer containery for the filtering of the g coffee into thev latter, as shown in full lines in Fig. l, wherebyto produce absolutely clear and most appetizing coffee. .When all of the coffee has been filtered, the innercontainer is removed l j and a cover (not shown) is applied to theouter container which thenis the coffee server. The

fact that the outer container is hot whenV theV coffee is filtered into it is obviously advantageous,

because the coffee can then beserved piping hot,

i as many preferit. The filtering process'iszin-' teresting to watch, and it is -for that reasolathatl on theY rim I 8.. The outerendof the nozzle.28, in the knob 22, is cutoff .at an acute angle'with i respectto its axis, as indicated .at 34, so asto provide a drippointat 35 at one side of the en- 1 largedouter end of the hole 32, from which Whatever small amountofzcoffee .that may get into 3 the acrid taste so Yfrequently found in coffee i 1 made the old way. The cover I1 with the lter cloth 25 therein may be applied to the inner con- 1 tainer either lbefore or after the coiiee is brewed; most housewives willv undoubtedly prefer applying the cover at the outset.` AsV soon as the coifee is ready for serving, the` inner container is removed by means of the handle I5and the'water I 'prefer to have the containers made of glass, and, of course, the-use of glass has still other advantages which are generally appreciated. judging from the increasing extent to which it is being used nowadays for-cooking utensils. 'I'he interesting phenomenon is the bubbling of air up through the center of the coiee in the container to relieve the vacuum in the space above the coffee While the coee is discharged in a multiplicity of ne streams from the holes 23 in the cover. I have found that the restricted orice 33 at the inner end of the tapered nozzle hole 32 apparently has to bear a certain relationship in its area to the combined area of the holes 23, otherwise coiee will flow downwardly through the hole 32, instead of air flowing upwardly therethrough. While there may be some other explanation for this phenomenon, one which I would offer as a plausible explanation is that the air takes the shortest path through the coffee to the vacuum chamber above the coffee in the container, and since the hole 32 terminates at an elevation appreciably above the elevationof the holes 23, due to the length of the nozzle.28, the air naturally takes this path. Another vexplanation isthat there isy less frictional resistance to flow of thecoffee through the interstices of the lter cloth 25 and through the holes 23 :thanthrough the long orifice 32, and therefore the coffee is discharged through the holes 23 instead'of.`

through the hole 32. 'Ihe bevelling off lof the outer end of the `nozzle 28 at 34 eliminatesthe danger of va drop of coffeeadherng to thelend of the nozzle after the container 'I has, been i placed on the container 8 in the position'shown in full lines in Fig. 1 Vfor iiltering the coffee from container I into container 8. Only a few drops will enter the holev 32 at thetime the container.

'I is inverted, and by insuring complete drainage thereof from the hole 32,I avoid danger of sealing the container 'I against inlet of air. If air:

were not permitted to enter through hole 32, they coffee could no-t be filtered, because there would be no way of relieving the vacuum createdinside the container 'I above the level of its liquid contents. I.

The handles IIIy and I5, I would now point out, are alike and interchangeable, both being equipped with a locking pin 36 for entry in the bayonet slots 31 provided in the spaced parallel free ends 38 of the bands II and I3.V The handle Ill, due to the shape of the container 8, has to be mountedV farther away from the container than is the case with the handle I5 inA relation to the Aassociated container 7. A spacer block 39 is therefore provided between the ends 38V next tothe container 8, and a bolt 48 is passed through the ends 38` of the band and through the intermediate spacer block 39 and has a nut @I threaded on the projecting end thereof to hold the parts in tight rigid relationship while permitting sliding movement of the handle-*III between the ends 38 of the band for entry of the pin 36 into theY bayonet slots 31. Sheet metal collars 42 Varelslidable back and forth on theends 38 of the bands,

II and I3, and when slid outwardly to the positions shown in Fig. 1,v serve by telescoping enturning of the handles about their pins 36 as axes. Each handle has two square 0r rectangularA projections 4,3 and 44', and whenV the handle is tobe set at the angle as shown by the handle I0,i`

the collar d2 nts over the projections 43,-but when the handle is to be sety horizontally, like. the;

handle I5, thecollar 42A fitsover the otherprojection 44. The opposed side Walls of the'collar 42 have indented detent portions 45 which when the rollers 42 are-in handle-locking position, are received inl circularfholes 46 provided -therefor in the ends 38 of the band in spaced relation to the bayonet slots II. There is sufiieient-springiness to the metal of the collars 42 to permit spreading of its opposed side walls for disengagement of the detent portions 45 from .the holes 46 when the collars 42 are slid awayfrom the handles I0 and I to permit removal thereof, but when the collars 42 are slid back into handle locking' position, the detent portions 45 engage in the holes 46 and make for 'very secure fastenings for the handles.

In closing, it will be noticed that the bands II and I3 are both arcuate in cross-section to conform to the rounded peripheries of the beads I2 and I4, respectively. However, near the outwardly bent ends 38, which are flattened, the bands are flattened, as indicated at 41, to engage the flattened portions 48 on the containers defining gaps between the adjacent ends of the beads I2 and I4. The engagement of the flattened portions 41 on the bands II and I3 with the flat surfaces 48 on the containers 'I and 8 is sufficient to prevent turning of the bands with respect to the containers, even though the bands may not happen to be mounted very tightly on the containers. If desired, the radius of crosssectional curvature on the inside of the bands I I and I3 may be slightly smaller than the radius of sectional curvature of the periphery of the beads I2 and I4, so that each band engages its bead circumferentially on the upper and lower portions of the bead, but there is a slight yspace left between the middle of the bead and the i11- side of the band. That permits tightening of the bands much more securely without danger of cracking the glass, even though no intermediate cushioning strip is employed, and, of course, I may provide such if desired. With that construction, as the bands are tightened more and more, their marginal circumferential edge portions are sprung more and more up to the point where the middle portions of the bands corne into actual tight engagement with the middle portions of the beads. The resilience in the bands tends t0 keep them tight at all times.

It is believed the foregoing description conveys a good understanding of the objects and advantages of my invention. The appended claims are drawn with a View to covering all legitimate modifications and adaptations.

I claim:

1. In combination, in a coffee brewer, a container, a removable cover therefor adapted to be secured on the container in closed position, said cover having filtering openings provided therein, and an air nozzle projecting inwardly from the central portion thereof, and a filter cloth of larger diameter than the container adapted to be clamped by its marginal edge portion between the cover and container in position covering the filtering openings in the cover, said filter cloth having a substantially central opening provided therein defined by a turned-over and sewed circular edge portion, said nozzle having a watertight fit in said opening.

2. As an article of manufacture, a cover for a coffee brewer container, comprising a perfo rated body adapted to receive a sheet of filtering material on the inner side thereof covering the perforations, and an elongated air inspirator nozzle on said body projecting from the plane of the inner side thereof and adapted toY extend through a hole provided therefor inthe filtering material, said nozzle having a longitudinal hole provided vtherein opening tol the outer side of said body, and said nozzleV projecting from the outer side of said body and having the opening therein terminating in a' truncated outer end portion slanted at an acuteangle to the axis of the nozzle, substantially as and for the purpose described.

3. As an article of. manufacture, a cover for a coffee brewing container, comprising a .perforated body adapted to receive a sheet of filtering material onithe inner side thereof -covering the perforations, and an elongated air inspirator nozzle on said body projecting from the plane of the inner side thereof and adapted to extend through a hole provided therefor in the filtering material, said nozzlel having a longitudinal hole provided therein opening to the outer side of said body, and said nozzle having an outer end portion integral with an operating knob projecting from the outer side of said body, the outer end of the nozzle being truncated at an acute angle to the axis thereof and relative to the outer end of the hole in the nozzle, substantially as and for the purpose described.

. 4. In a coffee brewer, the combination of a first bowl having an annular rim portion dening f the open mouth thereof, a second bowl having an annularly projecting bead portion in spaced relation to a reduced annular rim portion which defines the open mouth of the bowl, said annular bead portion being adapted to support the second bowl on the rim of the first bowl with the second bowl fitting'inside the first bowl and serving as the inner container of a doubleboiler, said annular bead portion being also adapted to support the second bowl on the rim of the first bowl in inverted position in which the reduced rim portion of the second bowl projects downwardly within the rim portion of the first bowl, and a filter head detachably secured to the rim of the second bowl and of small enough diameter to be entered with said rim inside the rim portion of the first bowl, said filter head including an air inlet tube which in the inverted position of the second bowl projects upwardly within the latter, and said first bowl having a pouring spout on the rim portion thereof which in the inverted position of said second bowl provides an air inlet opening for passage of air into the first bowl under the annular bead of the second bowl.

5. In a coffee brewer, the combination of a rst bowl having an annular rim portion defining the open mouth thereof, a second bowl having an annularly projecting bead portion in spaced relation to a reduced annular rim portion which defines the open mouth of the bowl, said annular bead portion being adapted to support the second bowl on the rim of the first bowl with the second bowl fitting inside the first bowl and serving as the inner container of a double-boiler, said annular bead portion being also adapted to support the second bowl on the rim of the first bowl in inverted position in which the reduced rim portion of the second bowl projects downwardly within the rim portion of the first bowl, and a filter head detachably secured to the rim of the second bowl and of small enough diameter to be entered with said rim. inside the rim portion of the first bowl, said filter head including an air vent which in the inverted position of the Second bowl extends abovethenead within said bowl.V Y Y A-6. In a .coiee brewer, theV combination onf'a rst bowl having an annular rim portion defining the open mouth thereof,` a second bowl having an annularly projecting bead portion in spaced relation to a reduced annular rim portion which denes the open mouth of the bowl, said annular bead portion being adapted to support the second bowlV on the rim of the first bowl with the second bowl ttingvinside the first bowl and serv-1 ing as the inner container of a double-boiler, said annular bead portion being also adapted to support thesecond bowl on the rim of the rst` bowl invinverted position in which the reduced rim portion of the second bowl-,projects down-.1 wardly withinthe rimportion Yof `the first bowl,

vtapered Ysubstantially vertical passage provided in said tube, the enlarged lower end of which opens to the under side of the filter head.V

` i HENRYF. KOVRS, 

